package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter("/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取请求url
        String url=  request.getServletPath();
        //2.判断请求路径是否是登录路径("/login")如果是,放行
        if(url.contains("login")){
            log.info("用户登录请求:"+url);
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头牌token
        String jwt = request.getHeader("token");
        //4.判断是否有token,没有则返回401
        if(jwt==null||jwt.isEmpty()){
            log.info("没有token");
            response.setStatus(401);
            return;
        }
        //5.检验令牌是否正确,不正确则返回401
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("token错误");
            response.setStatus(401);
            return;
        }
        //6.放行
        log.info("放行");
        filterChain.doFilter(request,response);

        //7.释放资源
        CurrentUserHoler.removeCurrentUser();
    }
}
